Science : Ch 11 – The Human Eye and the Colourful World

Which of the following statements is correct regarding the propagation of light of diferent colours of white light in air?

The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light:

The bluish colour of water in deep sea is due to:

The absorption of light by a molecule depends on the

In an experiment to trace the path of a ray of light through a triangular glass prism, a student would observe that the emergent ray

The red colour of the sun at the time of sunrise and sunset is because:

Power of a lens is the measure of the degree of

Ankit remarked that he has seen wavering of objects when seen through a stream of hot air rising above a tandoor or a fire. He said that the air just above the fire becomes hotter than the air further higher up. He further said that this wavering can also be seen in the earth’s atmosphere as the earth’s atmosphere is not evenly distributed and several observations can be explained on the basis of this phenomenon,name the phenomeoneon

Milk is a colloid that contains globules of fat and protein. When a beam of light is directed at a glass of milk the light is scattered. That is a great example

When sunlight passes through a canopy of a dense forest, tiny water droplets in the water scatter light.This is an example of

Rainbow is caused due to

The SI unit of Power of a lens is

The emergent ray in a prism bend at an angle to the direction of the

The colour of the clear sky blue due to

The sky appears black to an astronaut as there is no